FLIP-FLOP Tpye Soil Repellent and Release Finishing by th Oligomers Containing End-Capped Fluoroalkyls.

通过对聚酯表面的改性，考察了以全氟烷基过氧化氢和聚氧乙烯甲酸乙酯为原料合成的端基全氟烷基丙烯酸酯齐聚物的SR效率。在疏水环境下，将聚酯表面改性为疏油表面，其表面自由能小于25MJ/m2，分散组分为16~18MJ/m2，极性组分为2~6MJ/m^2。ESCA分析表明，氟烷基团与空气发生了亲油反应，形成了拒油表面；另一方面，随着时间的推移，水在改性表面的接触角逐渐减小。可以解释的是，在亲水环境下，聚氧乙烯基团膨胀，表面变得比原来更亲水。用不同极性的模拟油污洗涤实验也支持了丙烯酸酯齐聚物的触发作用。此外，还合成了一种新型的含氟烷基和吗啉基团的低聚硅烷偶联剂。用这些低聚硅烷修饰的玻璃表面也显示了触发器作用。对纺织品的应用目前正在调查中。

The SR efficiency of perfluoroalkyl end-capped acrylate oligomers, which were synthesized from perfluoroalkanoyl peroxides and polyoxyethylene methacylates, was ezamined based on the modification of polyester surface.Under hydrophobic environment, polyester surfaces were modified to be oleophobic and their surface free energies were less than 25 mj/m^2, the dispersive and polar components of which were 16-18 and 2-6 mj/m^2, respectively. Based on the ESCA analysis, the fluoroalkyl groups are proved to be oriented to the air to provide an oil repellent surface.On the other hand, with the elapse of time, the contact angles of water on the modified surface decreased below that of unmodified one. It can be interpreted that under hydrophilic environmant polyoxyethylene groups swell out the surface and the surface is changed to be more hydrophilic the original one. This is Called FLIP-FLOP mechanism.Washing experiments using model oily soil haning various polarities also supported the FLIP-FLOP action of the acrylate oligomers.Moreover, a novel type oligomeric silane coupling agent having fluoroalkyls and morpholide group was synthesized similarly. Glass surface modified with those oligomeric silanes also showed the FLIP-FLOP action. Application to textiles are now under investigation.